MESON Chess Problem Database

Problem Display
PID: 168344 (1b2NR1K/r5pN/2PPk2p/2PpP2B/3PP2B/1R6/Q5r1/5q2 w - - 0 1)

Petite, Efren

Freie Presse, 2003

1b2NR1K/r5pN/2PPk2p/2PpP2B/3PP2B/1R6/Q5r1/5q2

#2

14 + 8

6490 yacpdb 2018
5454 Near Snap 2022

SOLUTION

  • SOUND
  • Sets
    • 1...Qf5
      • 2.exf5#
    • 1...Qxf8+
      • 2.Sxf8#
  • Tries
    • 1.Sc7+?
      • 1...Bxc7
        • 2.Re8#
      • 1...Rxc7!
    • 1.Bg4+?
      • 1...Qf5
        • 2.Bxf5#
        • 2.exf5#
      • 1...Rxg4!
    • 1.Rbf3?
      • threat
        • 2.Qxd5#
        • 2.exd5#
      • 1...Qxf3
        • 2.Qxd5#
      • 1...Rgxa2
        • 2.Bg4#
      • 1...Raxa2
        • 2.Bf7#
      • 1...Qc4!
    • 1.Rg3?
      • threat
        • 2.Qxd5#
        • 2.exd5#
      • 1...Qxf8+
        • 2.Sxf8#
      • 1...Raxa2
        • 2.Sxg7#
      • 1...Qc4
        • 2.Bg4#
      • 1...Qf3
        • 2.Qxd5#
      • 1...Qf6
        • 2.Qxd5#
      • 1...Qf7
        • 2.Qxd5#
      • 1...Rf7
        • 2.Qxd5#
      • 1...Rgxa2!
    • 1.Rf6+?
      • 1...gxf6
        • 2.Sf8#
      • 1...Qxf6!
    • 1.Qxa7?
      • threat
        • 2.Qd7#
        • 2.Qe7#
      • 1...Qxf8+
        • 2.Sxf8#
      • 1...Bxd6
        • 2.Qd7#
      • 1...Bxa7
        • 2.Sc7#
      • 1...Qf6
        • 2.Qd7#
      • 1...Qf7
        • 2.Bxf7#
        • 2.Qxf7#
      • 1...Bc7
        • 2.Sxc7#
      • 1...dxe4!
  • Keys
    • 1.Rb7!
      • threat
        • 2.Qxd5#
        • 2.exd5#
      • 1...Qxf8+
        • 2.Sxf8#
      • 1...Rgxa2
        • 2.Sxg7#
      • 1...Raxa2
        • 2.Re7#
      • 1...Qc4
        • 2.Bf7#
      • 1...Qf3
        • 2.Qxd5#
      • 1...Qf6
        • 2.Qxd5#
      • 1...Qf7
        • 2.Bxf7#
        • 2.Qxd5#

This anticipates 168413(2008)

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 5
    • REMOVED MATES = 1
  • Sets
    • Q(a);OGATE::P(D),XQ(a)
    • Q(a);CHECK,XR(M)::S(K),XQ(a)
  • Tries
    • Try
      • S(L);CHECK
      • Vars
        • B(h);XS(L)::R(M)
      • Refutation
        • R(f);XS(L)
    • Try
      • B(H);CHECK
      • Refutation
        • R(b);XB(H)
    • Try
      • R(B);P_PINP(c)
      • Threat
        • DUALS(2)
      • Vars
        • Q(a);XR(B)::QAB1(A),XP(c)
        • R(b);N_GUARD,N_SPINP(c),XQ(A)::B(H)
        • R(f);N_GUARD,N_SPINP(c),XQ(A)::B(H)
      • Refutation
        • Q(a);N_SPINP(c)
    • Try
      • R(B);P_PINP(c)
      • Threat
        • DUALS(2)
      • Vars
        • Q(a);CHECK,XR(M)::S(K),XQ(a)
        • R(f);N_GUARD,N_SPINP(c),XQ(A)::S(L),XP(g)
        • Q(a);N_GUARD,N_SPINP(c)::B(H)
        • Q(a);::QAB1(A),XP(c)
        • R(f);::QAB1(A),XP(c)
      • Refutation
        • R(b);N_SPINP(c),XQ(A)
    • Try
      • R(M);CHECK
      • Vars
        • P(g);XR(M)::S(K)
      • Refutation
        • Q(a);XR(M)
    • Try
      • Q(A);XR(f)
      • Threat
        • DUALS(2)
      • Vars
        • Q(a);CHECK,XR(M)::S(K),XQ(a)
        • B(h);XP(J)::QAB1(A)
        • B(h);N_GUARD,XQ(A)::S(L)
        • Q(a);::QAB1(A)
        • B(h);N_GUARD::S(L),XB(h)
      • Refutation
        • P(c);XP(D)
  • Actual
    • R(B);P_PINP(c)
    • Threat
      • DUALS(2)
    • Vars
      • Q(a);CHECK,XR(M)::S(K),XQ(a)
      • R(b);N_GUARD,N_SPINP(c),XQ(A)::S(L),XP(g)
      • R(f);N_GUARD,N_SPINP(c),XQ(A)::R1(B)
      • Q(a);N_GUARD,N_SPINP(c)::B(H)
      • Q(a);::QAB1(A),XP(c)
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