MESON Chess Problem Database

Problem Display
PID: 17766 (1b1RN1BK/1b1n1RP1/7p/q1p1B2r/4k1pP/1Q1n4/p3NPP1/8 w - - 0 1)

Valve, Leo Erland

1st Prize, Ohquist MT, 1949

1b1RN1BK/1b1n1RP1/7p/q1p1B2r/4k1pP/1Q1n4/p3NPP1/8

#2

12 + 11

3105 FIDE Album (1945-1955) 1964
273 Mat Plus 1994

SOLUTION

  • SOUND
  • Sets
    • 1...Rxe5
      • 2.Qc4#
    • 1...Bxe5
      • 2.Qxb7#
    • 1...S3xe5
      • 2.Rf4#
    • 1...S7xe5
      • 2.Sg3#
  • Tries
    • 1.Bh7+?
      • 1...Kxe5
        • 2.Re7#
      • 1...Rf5!
    • 1.Rf4+?
      • 1...Kxe5
        • 2.Qe6#
      • 1...Sxf4!
    • 1.Qxd3+?
      • 1...Kxe5
        • 2.Re7#
      • 1...Kxd3!
  • Keys
    • 1.Re7!
      • threat
        • 2.Sg3#
      • 1...Kf5
        • 2.Bh7#
      • 1...Rxe5
        • 2.Bh7#
      • 1...Bxe5
        • 2.Sd6#
      • 1...S3xe5
        • 2.Qc2#
      • 1...S7xe5
        • 2.Qxd3#
      • 1...g3
        • 2.Sxg3#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 4
    • ADDED MATES = 2
    • REMOVED MATES = 0
  • Sets
    • R(g);SBLOCK,XB(F)::QAR2(D)
    • B(k);P_PINP(H),SBLOCK,XB(F)::QAB(D),XB(i)
    • S(b);N_GUARD,SBLOCK,XB(F)::R1(G)
    • S(j);SBLOCK,XB(F)::S(A)
  • Tries
    • Try
      • B(K);CHECK
      • Vars
        • K(c);P-FLIGHT,XB(F)::R(G)
      • Refutation
        • R(g);P_SPINR(g)
    • Try
      • R(G);CHECK
      • Vars
        • K(c);P-FLIGHT,XB(F)::QAR1(D)
      • Refutation
        • S(b);XR(G)
    • Try
      • Q(D);CHECK,XS(b)
      • Vars
        • K(c);P-FLIGHT,XB(F)::R(G)
      • Refutation
        • K(c);P_SPINS(j),S_FLIGHT,XQ(D)
  • Actual
    • R(G);
    • Threat
      • S(A)
    • Vars
      • K(c);S_FLIGHT::B(K)
      • R(g);N_GUARD,P_SPINR(g),XB(F)::B(K)
      • B(k);N_GUARD,P_PINP(H),P_SPINB(k),XB(F)::S(J)
      • S(b);OGATEB,P_SPINS(b),XB(F)::QAB(D)
      • S(j);P_SPINS(j),XB(F)::QAB1(D),XS(b)
      • P(d);::S(A),XP(d)
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