MESON Chess Problem Database

Problem Display
PID: 229114 (1b4N1/3n4/K1pP4/2p2k1p/4R2P/p2Q2P1/2B2r1p/7q w - - 0 1)

Kubbel, Arvid Ivanovich

Shakhmaty, 1926

1b4N1/3n4/K1pP4/2p2k1p/4R2P/p2Q2P1/2B2r1p/7q

#2

8 + 10

6490 yacpdb 2020

SOLUTION

  • SOUND
  • Sets
    • 1...Qxe4
      • 2.Qxe4#
    • 1...Sf6
      • 2.Se7#
  • Tries
    • 1.Re1+?
      • 1...Qe4
        • 2.Qxe4#
      • 1...Kg4!
    • 1.Re2+?
      • 1...Qe4
        • 2.Qxe4#
      • 1...Kg4!
    • 1.Re3+?
      • 1...Qe4
        • 2.Qxe4#
      • 1...Kg4!
    • 1.Re7+?
      • 1...Qe4
        • 2.Qxe4#
      • 1...Kg4!
    • 1.Re8+?
      • 1...Qe4
        • 2.Qxe4#
      • 1...Kg4!
    • 1.Qd5+?
      • 1...Kg6
        • 2.Rg4#
      • 1...Se5
        • 2.Rf4#
      • 1...cxd5!
  • Keys
    • 1.Qc4!
      • threat
        • 2.Qe6#
      • 1...Kg6
        • 2.Rg4#
      • 1...Qxe4
        • 2.Qxe4#
      • 1...Qf1
        • 2.Re2#
      • 1...Se5
        • 2.Rf4#
      • 1...Sf6
        • 2.Se7#
      • 1...Sf8
        • 2.Qf7#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 4
    • REMOVED MATES = 0
  • Sets
    • Q(a);OGATE,P_SPINQ(a),XR(D)::QAB1(B),XQ(a)
    • S(i);SBLOCK::S(H)
  • Tries
    • Try
      • R(D);CHECK
      • Vars
        • Q(a);N_GUARD,P_SPINQ(a)::QAB1(B),XQ(a)
      • Refutation
        • K(f);S_FLIGHT
    • Try
      • R(D);CHECK
      • Vars
        • Q(a);N_GUARD,P_SPINQ(a)::QAB1(B),XQ(a)
      • Refutation
        • K(f);S_FLIGHT
    • Try
      • R(D);CHECK
      • Vars
        • Q(a);N_GUARD,P_SPINQ(a)::QAB1(B),XQ(a)
      • Refutation
        • K(f);S_FLIGHT
    • Try
      • R(D);CHECK
      • Vars
        • Q(a);N_GUARD,P_SPINQ(a)::QAB1(B),XQ(a)
      • Refutation
        • K(f);S_FLIGHT
    • Try
      • R(D);CHECK
      • Vars
        • Q(a);N_GUARD,P_SPINQ(a)::QAB1(B),XQ(a)
      • Refutation
        • K(f);S_FLIGHT
    • Try
      • Q(B);CHECK
      • Vars
        • K(f);S_FLIGHT::B(A)+R(D),DCHECK
        • S(i);P_SPINS(i)::B(A)+R(D),DCHECK
      • Refutation
        • P(h);XQ(B)
  • Actual
    • Q(B);
    • Threat
      • QAB1(B)
    • Vars
      • K(f);S_FLIGHT::B(A)+R(D),DCHECK
      • Q(a);OGATE,P_SPINQ(a),XR(D)::QAB1(B),XQ(a)
      • Q(a);N_GUARD,P_PINQ(B)::B(A)+R(D)
      • S(i);SBLOCK::B(A)+R(D),DCHECK
      • S(i);SBLOCK::S(H)
      • S(i);N_GUARD::QAR2(B)
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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).