MESON Chess Problem Database

Problem Display
PID: 230944 (2KR4/5PNb/4Bp2/1NQ5/2P1kP1R/1qp2rpP/2n2p2/8 w - - 0 1)

Langstaff, William A

British Chess Magazine, 1931

2KR4/5PNb/4Bp2/1NQ5/2P1kP1R/1qp2rpP/2n2p2/8

#2

11 + 9

SOLUTION

  • SOUND
  • Sets
    • 1...Re3
      • 2.Qd5#
      • 2.Qc6#
    • 1...Bf5
      • 2.Bxf5#
    • 1...Bg8
      • 2.Bf5#
    • 1...Sa1
      • 2.Qd4#
    • 1...Se1
      • 2.Qd4#
    • 1...Sa3
      • 2.Qd4#
    • 1...Se3
      • 2.Rd4#
      • 2.Qd4#
    • 1...Sb4
      • 2.Qd4#
    • 1...Sd4
      • 2.Qxd4#
    • 1...f5
      • 2.Qe5#
  • Tries
    • 1.Sh5?
      • threat
        • 2.Sxf6#
      • 1...Rxf4
        • 2.Rxf4#
      • 1...Re3
        • 2.Qd5#
        • 2.Qc6#
      • 1...Sd4
        • 2.Qxd4#
      • 1...f5
        • 2.Sf6#
        • 2.Qe5#
      • 1...Rd3!
    • 1.Rd4+?
      • 1...Sxd4
        • 2.Qxd4#
      • 1...Ke3!
  • Keys
    • 1.Qe7!
      • threat
        • 2.Bf5#
      • 1...Qxc4+
        • 2.Bxc4#
      • 1...Ke3
        • 2.Bf5#
      • 1...Rxf4
        • 2.Bg4#
      • 1...Rd3
        • 2.Bd5#
      • 1...Re3
        • 2.Qb7#
      • 1...Bf5
        • 2.Bxf5#
      • 1...f5
        • 2.Bxf5#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 1
    • ADDED MATES = 5
    • REMOVED MATES = 6
  • Sets
    • B(i);N_GUARD,P_PINB(G)::B(G),XB(i)
    • B(i);N_GUARD::B(G)
    • S(a);N_GUARD::QAR1(F)
    • S(a);N_GUARD::QAR1(F),XS(a)
    • P(h);N_GUARD::QAR1(F)
  • Tries
    • Try
      • S(I);
      • Threat
        • S(I),XP(h)
      • Vars
        • R(e);OGATE,P_SPINR(e),XP(C)::R1(D),XR(e)
        • S(a);N_GUARD::QAR1(F),XS(a)
      • Refutation
        • R(e);
    • Try
      • R(K);CHECK
      • Vars
        • S(a);OGATE,XR(K)::QAR1(F),XS(a)
      • Refutation
        • K(g);P-FLIGHT
  • Actual
    • Q(F);
    • Threat
      • QAR(F)+B(G),DCHECK
    • Vars
      • Q(c);CHECK,OGATE,XP(B)::QAR(F)+B(G),XQ(c)
      • K(g);P-FLIGHT::QAR(F)+B(G)
      • R(e);P_SPINR(e),SBLOCK,XP(C)::QAR(F)+B(G)
      • R(e);SBLOCK::QAR(F)+B(G),DCHECK
      • R(e);SBLOCK::QAB(F)
      • B(i);P_PINB(G)::QAR(F)+B(G),DCHECK,XB(i)
      • P(h);::QAR(F)+B(G),DCHECK,XP(h)
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