MESON Chess Problem Database

Problem Display
PID: 17798 (2R2B2/1p6/2b5/P3Rp2/2k5/1N2rP2/BPn1P3/3K1Q2 w - - 0 1)

Valve, Leo Erland

3rd Prize, Szachy, 1949

2R2B2/1p6/2b5/P3Rp2/2k5/1N2rP2/BPn1P3/3K1Q2

#2

11 + 6

3105 FIDE Album (1945-1955) 1964
133 The Problemist Supplement 2011

SOLUTION

  • SOUND
  • Sets
    • 1...Rxe2
      • 2.Qxe2#
    • 1...Rxb3
      • 2.e3#
    • 1...Rd3+
      • 2.exd3#
    • 1...Rxf3
      • 2.exf3#
    • 1...Re4
      • 2.e3#
    • 1...Rxe5
      • 2.e4#
    • 1...Sb4
      • 2.Rc5#
    • 1...Sd4
      • 2.Sd2#
    • 1...b5
      • 2.Rxc6#
    • 1...b6
      • 2.Rxc6#
  • Tries
    • 1.Sa1+?
      • 1...Rb3
        • 2.e3#
      • 1...Kd4!
    • 1.Sc1+?
      • 1...Rb3
        • 2.e3#
      • 1...Kd4!
    • 1.Sd4+?
      • 1...Rb3
        • 2.e3#
      • 1...Kxd4!
    • 1.Ba3?
      • threat
        • 2.Rc5#
      • 1...Rd3+
        • 2.exd3#
      • 1...Rxe2
        • 2.Qxe2#
      • 1...Rxb3
        • 2.e3#
      • 1...Rxe5
        • 2.e4#
      • 1...b6
        • 2.Rxc6#
      • 1...Sxa3!
  • Keys
    • 1.Qg1!
      • threat
        • 2.Qg8#
      • 1...Rd3+
        • 2.Sd2#
      • 1...Rxe2
        • 2.Sc1#
      • 1...Rxb3
        • 2.Qc5#
      • 1...Rxe5
        • 2.Sd4#
      • 1...Sb4
        • 2.Rc5#
      • 1...Sd4
        • 2.Sd2#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 4
    • ADDED MATES = 0
    • REMOVED MATES = 4
  • Sets
    • R(b);OGATE,P_SPINR(b),XP(E)::QAB(B),XR(b)
    • R(b);OGATE,P_SPINR(b),XS(F)::QAB(B)+P(E)
    • R(b);CHECK,OGATE::P(E),XR(b)
    • R(b);OGATE,XP(G)::QAB(B)+P(E),XR(b)
    • R(b);OGATE::QAB(B)+P(E)
    • R(b);OGATE,XR(I)::QAB(B)+P(E)
    • S(a);SBLOCK::R1(I)
    • S(a);SBLOCK::B(C)+S(F),DCHECK
    • P(f);N_GUARD::R(J),XB(e)
  • Tries
    • Try
      • S(F);CHECK
      • Vars
        • R(b);OGATE,P_SPINR(b)::QAB(B)+P(E)
      • Refutation
        • K(c);N_SPINB(e),P-FLIGHT
    • Try
      • S(F);CHECK
      • Vars
        • R(b);OGATE,P_SPINR(b)::QAB(B)+P(E)
      • Refutation
        • K(c);N_SPINB(e),P-FLIGHT
    • Try
      • S(F);CHECK
      • Vars
        • R(b);OGATE,P_SPINR(b)::QAB(B)+P(E)
      • Refutation
        • K(c);N_SPINB(e),P-FLIGHT,XS(F)
    • Try
      • B(K);
      • Threat
        • R1(I)
      • Vars
        • R(b);CHECK,OGATE::P(E),XR(b)
        • R(b);OGATE,P_SPINR(b),XP(E)::QAB(B),XR(b)
        • R(b);OGATE,P_SPINR(b),XS(F)::QAB(B)+P(E)
        • R(b);OGATE,XR(I)::QAB(B)+P(E)
        • P(f);N_GUARD::R(J),XB(e)
      • Refutation
        • S(a);XB(K)
  • Actual
    • Q(B);
    • Threat
      • QAB(B)
    • Vars
      • R(b);CHECK::B(C)+S(F),DCHECK
      • R(b);N_GUARD,XP(E)::B(C)+S(F)
      • R(b);OGATE,P_SPINR(b),XS(F)::QAR1(B)
      • R(b);N_GUARD,XR(I)::B(C)+S(F)
      • S(a);SBLOCK::R1(I)
      • S(a);SBLOCK::B(C)+S(F),DCHECK
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