MESON Chess Problem Database

Problem Display
PID: 16504 (8/P1R1p2K/N1p1P3/1pBk2Np/2n1R3/1pr5/1r6/1b2n2Q w - - 0 1)

Cornell, CFT

Rains, Cyril George

Chess, 1941

8/P1R1p2K/N1p1P3/1pBk2Np/2n1R3/1pr5/1r6/1b2n2Q

#2

9 + 11

SOLUTION

  • SOUND
  • Sets
    • 1...Bxe4+
      • 2.Qxe4#
    • 1...Sc2
      • 2.Re3#
    • 1...Sd3
      • 2.Re2#
    • 1...Sd2
      • 2.Rd7#
    • 1...Sa3
      • 2.Rd7#
    • 1...Se3
      • 2.Rd7#
    • 1...Sa5
      • 2.Rd7#
  • Tries
    • 1.a8Q?
      • threat
        • 2.Qxc6#
      • 1...Bxe4+
        • 2.Qxe4#
      • 1...Sa5
        • 2.Rd7#
        • 2.Qd8#
      • 1...Se5!
    • 1.a8B?
      • threat
        • 2.Bxc6#
      • 1...Bxe4+
        • 2.Qxe4#
      • 1...Sa5
        • 2.Rd7#
      • 1...Se5!
  • Keys
    • 1.Rxc6!
      • threat
        • 2.Sb4#
      • 1...Bxe4+
        • 2.Qxe4#
      • 1...Kxc6
        • 2.a8Q#
        • 2.a8B#
      • 1...Sc2
        • 2.Re3#
      • 1...Sd3
        • 2.Re2#
      • 1...b4
        • 2.Sxb4#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 1
    • REMOVED MATES = 4
  • Sets
    • B(a);CHECK,OGATE,P_SPINB(a),XR(B)::QAB1(A),XB(a)
    • S(b);N_PINR(B)::QAB(A)+R(B)
    • S(f);N_GUARD::R(H)
  • Tries
    • Try
      • P(G);P_PINP(j)
      • Threat
        • QAB1(G),XP(j)
      • Vars
        • B(a);CHECK,OGATE,P_SPINB(a),XR(B)::QAB1(A),XB(a)
      • Refutation
        • S(f);
    • Try
      • P(G);P_PINP(j)
      • Threat
        • B(G),XP(j)
      • Vars
        • B(a);CHECK,OGATE,P_SPINB(a),XR(B)::QAB1(A),XB(a)
        • S(f);N_GUARD::R(H)
      • Refutation
        • S(f);
  • Actual
    • R(H);XP(j)
    • Threat
      • S(E)
    • Vars
      • B(a);CHECK,OGATE,P_SPINB(a),XR(B)::QAB1(A),XB(a)
      • K(h);S_FLIGHT,XR(H)::P=Q
      • S(b);N_PINR(B)::QAB(A)+R(B)
      • P(g);::S(E),XP(g)
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