MESON Chess Problem Database

Problem Display
PID: 18464 (bQq5/3p4/1b1N4/3n1B2/3pR2p/1RN3k1/r3Pr2/4B2K w - - 0 1)

Guttman, Newman

Hassberg, Eric Manfred

American Chess Bulletin, 1956

bQq5/3p4/1b1N4/3n1B2/3pR2p/1RN3k1/r3Pr2/4B2K

#2

9 + 10

SOLUTION

  • SOUND
  • Sets
    • 1...Qa6
      • 2.Qg8#
    • 1...Qb7
      • 2.Qg8#
    • 1...Qxc3
      • 2.Qg8#
    • 1...Qc4
      • 2.Qg8#
    • 1...Qc5
      • 2.Qg8#
    • 1...Qc6
      • 2.Qg8#
    • 1...Qc7
      • 2.Qg8#
    • 1...Qg8
      • 2.Qxg8#
    • 1...Rxe2
      • 2.Sxe2#
    • 1...h3
      • 2.Rg4#
  • Tries
    • 1.Sd1+?
      • 1...Qc3
        • 2.Bxf2#
        • 2.Qg8#
      • 1...Sc3
        • 2.Bxf2#
      • 1...Se3
        • 2.Bxf2#
      • 1...d3!
    • 1.Sxd5+?
      • 1...Qc3
        • 2.Qg8#
      • 1...d3!
    • 1.Re3+?
      • 1...Sxe3+
        • 2.Sde4#
      • 1...dxe3
        • 2.Sde4#
      • 1...Kf4!
  • Keys
    • 1.Rxd4!
      • threat
        • 2.Sde4#
      • 1...Sf4+
        • 2.Sce4#
      • 1...Sc7+
        • 2.Sd5#
      • 1...Qxb8
        • 2.Sxd5#
      • 1...Rxe2
        • 2.Sxe2#
      • 1...Bc7
        • 2.Sxd5#
      • 1...Qc7
        • 2.Qg8#
      • 1...h3
        • 2.Rg4#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 4
    • REMOVED MATES = 7
  • Sets
    • Q(j);OGATE::QAR(I)
    • Q(j);OGATE,P_SPINQ(j),XS(E)::QAR(I)
    • Q(j);OGATE::QAR(I),XQ(j)
    • R(a);XP(C)::R(D)+S(E),DCHECK,XR(a)
    • P(e);SBLOCK::R1(F)
  • Tries
    • Try
      • S(E);CHECK
      • Vars
        • S(f);P_PINR(F),P_SPINS(f)::B(A),XR(b)
      • Refutation
        • P(d);P_SPINP(d)
    • Try
      • S(E);CHECK,XS(f)
      • Vars
        • Q(j);OGATE,P_SPINQ(j)::QAR(I)
      • Refutation
        • P(d);P_SPINP(d)
    • Try
      • R(F);CHECK
      • Vars
        • S(f);CHECK,XR(F)::QAB(I)+S(H),DCHECK
        • P(d);XR(F)::QAB(I)+S(H),DCHECK
      • Refutation
        • K(c);N_SPINR(b),S_FLIGHT
  • Actual
    • R(F);XP(d)
    • Threat
      • QAB(I)+S(H),DCHECK
    • Vars
      • S(f);CHECK,SBLOCK::R(D)+S(E),DCHECK
      • S(f);CHECK,S_CUTQ(j)::R(D)+S(E)
      • Q(j);N_GUARD,XQ(I)::R(D)+S(E),XS(f)
      • R(a);XP(C)::R(D)+S(E),DCHECK,XR(a)
      • B(g);S_CUTQ(j)::R(D)+S(E),XS(f)
      • Q(j);OGATE::QAR(I)
      • P(e);SBLOCK::R1(F)
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