MESON Chess Problem Database

Problem Display
PID: 222534 (3R4/n1P3P1/2p1PK2/2Nq1Qp1/1Ppk2Np/2pb2p1/5r1r/3Rn1B1 w - - 0 1)

Retter, Yosef

Variantim, 2003

3R4/n1P3P1/2p1PK2/2Nq1Qp1/1Ppk2Np/2pb2p1/5r1r/3Rn1B1

#2

11 + 13

SOLUTION

  • SOUND
  • Sets
    • 1...Qd6
      • 2.Rxd6#
    • 1...Qd7
      • 2.Rxd7#
    • 1...Qxd8+
      • 2.cxd8Q#
      • 2.cxd8R#
    • 1...Sf3
      • 2.Qe4#
    • 1...g2
      • 2.Bxf2#
      • 2.Qxf2#
  • Tries
    • 1.Kxg5?
      • threat
        • 2.Qe5#
      • 1...Qxd8+
        • 2.cxd8Q#
        • 2.cxd8R#
      • 1...Sf3+!
    • 1.Ke7?
      • threat
        • 2.Qe4#
        • 2.Qe5#
        • 2.Qf6#
      • 1...Qd6+
        • 2.Rxd6#
      • 1...Qd7+
        • 2.Rxd7#
      • 1...Qxd8+
        • 2.cxd8Q#
        • 2.cxd8R#
      • 1...c2
        • 2.Qe5#
        • 2.Qf6#
      • 1...Sf3
        • 2.Qe4#
      • 1...Sc8+!
    • 1.Bxf2+?
      • 1...gxf2
        • 2.Qe4#
        • 2.Qe5#
      • 1...Rxf2!
  • Keys
    • 1.Kf7!
      • threat
        • 2.Qf6#
      • 1...Qd7+
        • 2.Rxd7#
      • 1...Qxd8
        • 2.cxd8Q#
        • 2.cxd8R#
      • 1...Qd6
        • 2.Rxd6#
      • 1...Sf3
        • 2.Qe4#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 0
    • REMOVED MATES = 0
  • Sets
    • Q(j);OGATEB,P_PINP(G)::R(K),XQ(j)
    • Q(j);OGATEB::R(K),XQ(j)
    • Q(j);CHECK,N_SPINQ(j),OGATE,XR(K)::PXQ(j)=Q
    • S(a);N_PINQ(F)::QAR1(F)
  • Tries
    • Try
      • K(H);S_FLIGHT,XP(k)
      • Threat
        • QAB1(F)
      • Vars
        • Q(j);CHECK,N_PINQ(F),N_SPINQ(j),OGATE,XR(K)::PXQ(j)=Q
      • Refutation
        • S(a);CHECK
    • Try
      • K(H);N_SPINQ(F),S_FLIGHT
      • Threat
        • DUALS(3)
      • Vars
        • Q(j);CHECK,OGATEB::R(K),XQ(j)
        • Q(j);CHECK,N_SPINQ(j),OGATE,XR(K)::PXQ(j)=Q
        • S(a);::QAR1(F)
      • Refutation
        • S(m);CHECK
    • Try
      • B(B);CHECK,N_SPINQ(F),XR(b)
      • Refutation
        • R(c);P_PINQ(F),XB(B)
  • Actual
    • K(H);P-FLIGHT,P_SPINP(G)
    • Threat
      • QAB(F)
    • Vars
      • Q(j);CHECK,N_PINP(G),OGATEB::R(K),XQ(j)
      • Q(j);N_PINP(G),N_SPINQ(j),OGATE,XR(K)::PXQ(j)=Q
      • Q(j);N_PINP(G),OGATEB::R(K),XQ(j)
      • S(a);N_PINQ(F)::QAR1(F)
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