MESON Chess Problem Database

Problem Display
PID: 203414 (5K2/3p4/3Rrkp1/6p1/1pN1P1p1/B1q3p1/1Q1R4/8 w - - 0 1)

Meurs, Abraham

Good Companions, 1924

5K2/3p4/3Rrkp1/6p1/1pN1P1p1/B1q3p1/1Q1R4/8

#2

7 + 9

6490 yacpdb 2020

SOLUTION

  • SOUND
  • Sets
    • 1...Qxb2
      • 2.Bxb2#
    • 1...Qd4
      • 2.Qxd4#
    • 1...Qe5
      • 2.Qxe5#
    • 1...Rxd6
      • 2.Rxd6#
    • 1...g2
      • 2.Rf2#
    • 1...bxa3
      • 2.Qxc3#
    • 1...b3
      • 2.Qxc3#
  • Tries
    • 1.Bxb4?
      • threat
        • 2.Bxc3#
        • 2.Qxc3#
      • 1...Rxd6
        • 2.Rxd6#
      • 1...Qd4
        • 2.Qxd4#
      • 1...Qe5
        • 2.Qxe5#
      • 1...Qxb2!
    • 1.Rd1?
      • threat
        • 2.Rf1#
      • 1...Qxb2
        • 2.Bxb2#
      • 1...Rxd6
        • 2.Rxd6#
      • 1...g2!
    • 1.Rc2?
      • 1...Qxb2
        • 2.Bxb2#
      • 1...bxa3
        • 2.Qxc3#
      • 1...Qd4
        • 2.Qxd4#
      • 1...Qe5
        • 2.Qxe5#
      • 1...g2
        • 2.Rf2#
      • 1...b3
        • 2.Qxc3#
      • 1...Rxd6!
    • 1.Re2?
      • 1...Qxb2
        • 2.Bxb2#
      • 1...bxa3
        • 2.Qxc3#
      • 1...Qd4
        • 2.Qxd4#
      • 1...Qe5
        • 2.Qxe5#
      • 1...g2
        • 2.Rf2#
      • 1...b3
        • 2.Qxc3#
      • 1...Rxd6!
    • 1.Rg2?
      • 1...Qxb2
        • 2.Bxb2#
      • 1...bxa3
        • 2.Qxc3#
      • 1...Qd4
        • 2.Qxd4#
      • 1...Qe5
        • 2.Qxe5#
      • 1...b3
        • 2.Qxc3#
      • 1...Rxd6!
    • 1.R2d5?
      • 1...Qxb2
        • 2.Bxb2#
      • 1...Rxd6
        • 2.Rxd6#
      • 1...bxa3
        • 2.Qxc3#
      • 1...Qd4
        • 2.Qxd4#
      • 1...Qe5
        • 2.Qxe5#
      • 1...b3
        • 2.Qxc3#
      • 1...g2!
    • 1.Rxe6+?
      • 1...Kxe6
        • 2.Rd6#
      • 1...dxe6!
    • 1.Qa1?
      • 1...Rxd6
        • 2.Rxd6#
      • 1...bxa3
        • 2.Qxc3#
      • 1...g2
        • 2.Rf2#
      • 1...Qb2
        • 2.Bxb2#
        • 2.Qxb2#
        • 2.Qf1#
      • 1...Qd4
        • 2.Qxd4#
      • 1...Qe5
        • 2.Qxe5#
      • 1...b3
        • 2.Qxc3#
      • 1...Qxa1!
    • 1.e5+?
      • 1...Qxe5
        • 2.Qxe5#
      • 1...Kf5!
  • Keys
    • 1.R2d3!
      • 1...Qxb2
        • 2.Bxb2#
      • 1...Rxd6
        • 2.Rxd6#
      • 1...bxa3
        • 2.Qxc3#
      • 1...Qd4
        • 2.Qxd4#
      • 1...Qe5
        • 2.Qxe5#
      • 1...g2
        • 2.Qf2#
      • 1...b3
        • 2.Qxc3#

FEATURES

  • Static
    • TYPE = MUTATE
    • CHANGED MATES = 1
    • ADDED MATES = 0
    • REMOVED MATES = 0
  • Sets
    • Q(a);N_SPINQ(a),OGATE,XQ(A)::B(C),XQ(a)
    • Q(a);OGATE::QAB(A),XQ(a)
    • Q(a);OGATE::QAB1(A),XQ(a)
    • R(f);N_SPINR(f),OGATE,XR(F)::R(B),XR(f)
    • P(b);N_GUARD::R(B)
    • P(c);N_GUARD,XB(C)::QAB(A),XQ(a)
    • P(c);N_GUARD::QAB(A),XQ(a)
  • Tries
    • Try
      • B(C);XP(c)
      • Threat
        • DUALS(2)
      • Vars
        • R(f);N_SPINR(f),OGATE,XR(F)::R(B),XR(f)
        • Q(a);OGATE::QAB(A),XQ(a)
        • Q(a);OGATE::QAB1(A),XQ(a)
      • Refutation
        • Q(a);N_SPINQ(a),XQ(A)
    • Try
      • R(B);
      • Threat
        • R(B)
      • Vars
        • Q(a);N_SPINQ(a),OGATE,XQ(A)::B(C),XQ(a)
        • R(f);N_SPINR(f),OGATE,XR(F)::R(B),XR(f)
      • Refutation
        • P(b);
    • Try
      • R(B);
      • Vars
        • Q(a);N_SPINQ(a),OGATE,XQ(A)::B(C),XQ(a)
        • P(c);N_GUARD,XB(C)::QAB(A),XQ(a)
        • Q(a);OGATE::QAB(A),XQ(a)
        • Q(a);OGATE::QAB1(A),XQ(a)
        • P(b);N_GUARD::R(B)
        • P(c);N_GUARD::QAB(A),XQ(a)
      • Refutation
        • R(f);N_SPINR(f),XR(F)
    • Try
      • R(B);
      • Vars
        • Q(a);N_SPINQ(a),OGATE,XQ(A)::B(C),XQ(a)
        • P(c);N_GUARD,XB(C)::QAB(A),XQ(a)
        • Q(a);OGATE::QAB(A),XQ(a)
        • Q(a);OGATE::QAB1(A),XQ(a)
        • P(b);N_GUARD::R(B)
        • P(c);N_GUARD::QAB(A),XQ(a)
      • Refutation
        • R(f);N_SPINR(f),XR(F)
    • Try
      • R(B);
      • Vars
        • Q(a);N_SPINQ(a),OGATE,XQ(A)::B(C),XQ(a)
        • P(c);N_GUARD,XB(C)::QAB(A),XQ(a)
        • Q(a);OGATE::QAB(A),XQ(a)
        • Q(a);OGATE::QAB1(A),XQ(a)
        • P(c);N_GUARD::QAB(A),XQ(a)
      • Refutation
        • R(f);N_SPINR(f),XR(F)
    • Try
      • R(B);
      • Vars
        • Q(a);N_SPINQ(a),OGATE,XQ(A)::B(C),XQ(a)
        • R(f);N_SPINR(f),OGATE,XR(F)::R(B),XR(f)
        • P(c);N_GUARD,XB(C)::QAB(A),XQ(a)
        • Q(a);OGATE::QAB(A),XQ(a)
        • Q(a);OGATE::QAB1(A),XQ(a)
        • P(c);N_GUARD::QAB(A),XQ(a)
      • Refutation
        • P(b);
    • Try
      • R(F);CHECK,XR(f)
      • Vars
        • K(g);N_SPINQ(a),P-FLIGHT,XR(F)::R1(B)
      • Refutation
        • P(i);XR(F)
    • Try
      • Q(A);
      • Vars
        • R(f);N_SPINR(f),OGATE,XR(F)::R(B),XR(f)
        • P(c);N_GUARD,XB(C)::QAB(A),XQ(a)
        • P(b);N_GUARD::R(B)
        • Q(a);OGATE::QAB(A),XQ(a)
        • Q(a);OGATE::QAB1(A),XQ(a)
        • P(c);N_GUARD::QAB(A),XQ(a)
      • Refutation
        • Q(a);N_SPINQ(a),XQ(A)
    • Try
      • P(E);CHECK,N_PINQ(a)
      • Vars
        • Q(a);OGATE,P_SPINQ(a),XP(E)::QAB1(A),XQ(a)
      • Refutation
        • K(g);N_SPINR(f),P-FLIGHT
  • Actual
    • R(B);
    • Vars
      • Q(a);N_SPINQ(a),OGATE,XQ(A)::B(C),XQ(a)
      • R(f);N_SPINR(f),OGATE,XR(F)::R(B),XR(f)
      • P(c);N_GUARD,XB(C)::QAB(A),XQ(a)
      • Q(a);OGATE::QAB(A),XQ(a)
      • Q(a);OGATE::QAB1(A),XQ(a)
      • P(b);N_GUARD::QAR(A)
      • P(c);N_GUARD::QAB(A),XQ(a)
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Developed and maintained by Brian Stephenson.
Implemented with HTML5, MySQL, Perl (with, inter alia, CGI::Simple, HTML::Template & XML::LibXML) & CSS/Javascript (jQuery, Bootstrap & DataTables).