MESON Chess Problem Database

Problem Display
PID: 241376 (4K3/2N5/1pp5/Q1r2R2/3PkPP1/R4p2/1pN1Pr2/1B1nn3 w - - 0 1)

Hjelle, David

Norsk Sjakkblad, 1934

4K3/2N5/1pp5/Q1r2R2/3PkPP1/R4p2/1pN1Pr2/1B1nn3

#2

11 + 9

15148 Sadier Collection 2021

SOLUTION

  • SOUND
  • Sets
    • 1...Rxc2
      • 2.Qe5#
    • 1...Rc3
      • 2.Qe5#
    • 1...Rc4
      • 2.Qe5#
    • 1...Re5+
      • 2.Qxe5#
    • 1...Rxf5
      • 2.Qxf5#
    • 1...Se3
      • 2.Rxe3#
    • 1...Sd3
      • 2.exd3#
  • Tries
    • 1.Sxe1+?
      • 1...Rc2
        • 2.Qe5#
      • 1...Kxd4!
    • 1.Se6?
      • threat
        • 2.Sg5#
      • 1...Rxc2
        • 2.Re5#
        • 2.Qe5#
      • 1...Rxf5
        • 2.Sxe1#
        • 2.Qxf5#
      • 1...Re5
        • 2.Sxe1#
        • 2.Rxe5#
        • 2.Qxe5#
      • 1...Sxc2!
    • 1.Re5+?
      • 1...Rxe5+
        • 2.Qxe5#
      • 1...Kxf4!
    • 1.Qxc5?
      • threat
        • 2.Sxe1#
        • 2.Qe7#
        • 2.Qe5#
        • 2.Qxc6#
      • 1...Rxe2
        • 2.Qe7#
        • 2.Qe5#
        • 2.Qxc6#
      • 1...Sxc2
        • 2.Bxc2#
        • 2.Qe5#
      • 1...Sc3
        • 2.Qe7#
        • 2.Qe5#
      • 1...Se3
        • 2.Rxe3#
        • 2.Qe7#
        • 2.Qe5#
      • 1...Sg2
        • 2.Sa1#
        • 2.Se1#
        • 2.Se3#
        • 2.Sb4#
        • 2.Qe7#
        • 2.Qe5#
        • 2.Qxc6#
      • 1...Sd3
        • 2.Qxc6#
        • 2.exd3#
      • 1...bxc5!
    • 1.dxc5?
      • threat
        • 2.Ra4#
        • 2.Qb4#
        • 2.Qa4#
      • 1...Rxe2
        • 2.Qb4#
        • 2.Qa4#
      • 1...Sxc2
        • 2.Qb4#
        • 2.Qa4#
      • 1...fxe2
        • 2.Qb4#
        • 2.Qa4#
      • 1...bxa5
        • 2.Ra4#
      • 1...Sc3
        • 2.Qb4#
      • 1...Se3
        • 2.Rxe3#
      • 1...Sd3
        • 2.exd3#
      • 1...b5
        • 2.Qb4#
      • 1...bxc5!
  • Keys
    • 1.Qb4!
      • threat
        • 2.dxc5#
      • 1...Re5+
        • 2.dxe5#
      • 1...Rxc2
        • 2.d5#
      • 1...Rxf5
        • 2.d5#
      • 1...Rc3
        • 2.Qe7#
      • 1...Rc4
        • 2.Qe7#
      • 1...Ra5
        • 2.Sxe1#
        • 2.d5#
      • 1...Rb5
        • 2.Sxe1#
      • 1...Rd5
        • 2.Sxe1#
      • 1...Se3
        • 2.Rxe3#
      • 1...Sd3
        • 2.exd3#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 5
    • ADDED MATES = 2
    • REMOVED MATES = 0
  • Sets
    • R(g);OGATE,P_SPINR(g),XS(B)::QAR1(H)
    • R(g);OGATE::QAR1(H)
    • R(g);CHECK,OGATE::QAR1(H),XR(g)
    • R(g);OGATE,XR(I)::QAB1(H),XR(g)
    • S(a);N_GUARD::R1(D),XS(a)
    • S(b);OGATE::P(C),XS(b)
  • Tries
    • Try
      • S(B);CHECK,XS(b)
      • Vars
        • R(g);OGATE,P_SPINR(g)::QAR1(H)
      • Refutation
        • K(f);P-FLIGHT,XP(E)
    • Try
      • S(J);
      • Threat
        • S(J)
      • Refutation
        • S(b);P_SPINS(b),XS(B)
    • Try
      • R(I);CHECK
      • Vars
        • R(g);CHECK,OGATE,XR(I)::QAR1(H),XR(g)
      • Refutation
        • K(f);P-FLIGHT,XP(F)
    • Try
      • Q(H);XR(g)
      • Threat
        • DUALS(4)
      • Refutation
        • P(h);XQ(H)
    • Try
      • P(E);XR(g)
      • Threat
        • DUALS(3)
      • Vars
        • P(h);XQ(H)::R(D)
        • S(a);::QAR(H)
        • S(a);N_GUARD::R1(D),XS(a)
        • S(b);OGATE::P(C),XS(b)
        • P(h);::QAR(H)
      • Refutation
        • P(h);XP(E)
  • Actual
    • Q(H);
    • Threat
      • QAR(H)+P(E),XR(g)
    • Vars
      • R(g);CHECK,OGATE::QAR(H)+P(E),XR(g)
      • R(g);N_GUARD,P_SPINR(g),XS(B)::QAR(H)+P(E)
      • R(g);N_GUARD,XR(I)::QAR(H)+P(E)
      • R(g);OGATE::QAR(H)
      • R(g);N_GUARD::B(A)+S(B),XS(b)
      • S(a);N_GUARD::R1(D),XS(a)
      • S(b);OGATE::P(C),XS(b)
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