MESON Chess Problem Database

Problem Display
PID: 261995 (2q2R2/2pkpPP1/1pN5/1p1K1P2/1N1p1b2/2P1P3/Q7/3R3n w - - 0 1)

Andersson, Sven Tore

Problemnoter, 1956

2q2R2/2pkpPP1/1pN5/1p1K1P2/1N1p1b2/2P1P3/Q7/3R3n

#2

11 + 9

15601 Albrecht-Leiss-Degener Collection 2022

SOLUTION

  • SOUND
  • Sets
    • 1...Qa6
      • 2.Sb8#
      • 2.Rd8#
    • 1...Qb7
      • 2.Rd8#
    • 1...Qb8
      • 2.Sxb8#
    • 1...Qd8
      • 2.Rxd8#
    • 1...Qe8
      • 2.fxe8Q#
    • 1...Bxe3
      • 2.Se5#
    • 1...Be5
      • 2.Sxe5#
    • 1...Bg5
      • 2.Se5#
    • 1...Bh6
      • 2.Se5#
    • 1...e5
      • 2.fxe5 ep#
    • 1...e6+
      • 2.fxe6#
  • Tries
    • 1.Qa6?
      • threat
        • 2.Qxc8#
      • 1...e6+
        • 2.fxe6#
      • 1...Qxa6
        • 2.Sb8#
        • 2.Rd8#
      • 1...Qxf8
        • 2.gxf8S#
      • 1...Qb7
        • 2.Rd8#
      • 1...Qb8
        • 2.Sxb8#
      • 1...Qd8
        • 2.Rxd8#
      • 1...Qe8
        • 2.fxe8Q#
        • 2.fxe8B#
      • 1...Qa8!
    • 1.Qa8?
      • threat
        • 2.Qxc8#
      • 1...e6+
        • 2.fxe6#
      • 1...Qxf8
        • 2.gxf8S#
      • 1...Qa6
        • 2.Sb8#
        • 2.Rd8#
        • 2.Qd8#
        • 2.Qe8#
      • 1...Qb7
        • 2.Rd8#
        • 2.Qd8#
        • 2.Qe8#
      • 1...Qb8
        • 2.Sxb8#
      • 1...Qd8
        • 2.Rxd8#
        • 2.Qxd8#
      • 1...Qe8
        • 2.Qxe8#
        • 2.fxe8Q#
        • 2.fxe8B#
      • 1...Qxa8!
  • Keys
    • 1.Kxd4!
      • threat
        • 2.Qe6#
      • 1...Bxe3+
        • 2.Kxe3#
      • 1...Be5+
        • 2.Kxe5#
      • 1...e5+
        • 2.Ke4#
      • 1...Kd6
        • 2.Qd5#
      • 1...e6
        • 2.Qxe6#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 4
    • ADDED MATES = 1
    • REMOVED MATES = 6
  • Sets
    • Q(i);N_GUARD,P_PINS(H)::R1(K)
    • Q(i);N_GUARD::S(H),XQ(i)
    • Q(i);N_GUARD::R1(K),XQ(i)
    • Q(i);OGATE::PXQ(i)=Q
    • B(c);N_GUARD,XP(D)::S(H)
    • B(c);N_GUARD::S(H),XB(c)
    • B(c);N_GUARD::S(H)
    • P(h);OGATE::P(G),XP(h),EP
    • P(h);CHECK,OGATE::P(G),XP(h)
  • Tries
    • Try
      • Q(B);
      • Threat
        • QAB1(B),XQ(i)
      • Vars
        • P(h);CHECK,OGATE::P(G),XP(h)
        • Q(i);OGATE,XR(K)::PXQ(i)=S
        • Q(i);N_GUARD,P_PINS(H)::R1(K)
        • Q(i);N_GUARD::S(H),XQ(i)
        • Q(i);N_GUARD::R1(K),XQ(i)
        • Q(i);OGATE::PXQ(i)=Q
      • Refutation
        • Q(i);P_PINS(H)
    • Try
      • Q(B);
      • Threat
        • QAB1(B),XQ(i)
      • Vars
        • P(h);CHECK,OGATE::P(G),XP(h)
        • Q(i);OGATE,XR(K)::PXQ(i)=S
        • Q(i);N_GUARD::S(H),XQ(i)
      • Refutation
        • Q(i);P_PINS(H),XQ(B)
  • Actual
    • K(F);P-FLIGHT,XP(b)
    • Threat
      • QAB1(B)
    • Vars
      • B(c);CHECK,XP(D)::R(A)+K(F),XB(c)
      • B(c);CHECK::R(A)+K(F),XB(c)
      • P(h);CHECK,S_CUTB(c)::R(A)+K(F)
      • K(g);P-FLIGHT,S_CUTB(c)::QAR1(B)
      • P(h);::QAB1(B),XP(h)
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