MESON Chess Problem Database

Problem Display
PID: 205120 (1B4R1/3Q4/8/3q2p1/1Ppk4/1brPpP2/2n1p2K/1B6 w - - 0 1)

Ellerman, Arnoldo

American Chess Bulletin, 1953

1B4R1/3Q4/8/3q2p1/1Ppk4/1brPpP2/2n1p2K/1B6

#2

8 + 9

15148 Sadier Collection 2020

SOLUTION

  • SOUND
  • Sets
    • 1...Kxd3
      • 2.Qxd5#
    • 1...Qd6+
      • 2.Qxd6#
  • Tries
    • 1.Be5+?
      • 1...Kxd3
        • 2.Qxd5#
      • 1...Kxe5!
    • 1.Ba7+?
      • 1...Kxd3
        • 2.Qxd5#
      • 1...Ke5!
    • 1.Rxg5?
      • threat
        • 2.Rxd5#
        • 2.Qxd5#
      • 1...Qd6+
        • 2.Qxd6#
      • 1...Kxd3
        • 2.Rxd5#
        • 2.Qxd5#
      • 1...Rxd3
        • 2.Be5#
      • 1...Sxb4
        • 2.Ba7#
      • 1...cxd3
        • 2.Rg4#
      • 1...Qxd7!
    • 1.Qg4+?
      • 1...Qe4
        • 2.Rd8#
        • 2.Qxe4#
      • 1...Kxd3!
    • 1.Qa7+?
      • 1...Qc5
        • 2.Rd8#
      • 1...Kxd3!
  • Keys
    • 1.Rd8!
      • threat
        • 2.Qxd5#
      • 1...Qd6+
        • 2.Qxd6#
      • 1...Kxd3
        • 2.Qxd5#
      • 1...Qxd7
        • 2.Rxd7#
      • 1...Rxd3
        • 2.Qg7#
      • 1...Sxb4
        • 2.Qa7#
      • 1...cxd3
        • 2.Qg4#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 4
    • REMOVED MATES = 0
  • Sets
    • K(g);P-FLIGHT,P_SPINS(a),XP(C)::QAR2(F),XQ(h)
    • Q(h);CHECK,OGATEB::QAR2(F),XQ(h)
  • Tries
    • Try
      • B(G);CHECK
      • Vars
        • K(g);P-FLIGHT,P_SPINS(a),XP(C)::QAR2(F),XQ(h)
      • Refutation
        • K(g);N_SPINQ(h),S_FLIGHT,XB(G)
    • Try
      • B(G);CHECK
      • Vars
        • K(g);P-FLIGHT,P_SPINS(a),XP(C)::QAR2(F),XQ(h)
      • Refutation
        • K(g);N_SPINQ(h),S_FLIGHT
    • Try
      • R(H);XP(i)
      • Threat
        • DUALS(2)
      • Vars
        • Q(h);CHECK,OGATEB::QAR2(F),XQ(h)
        • R(d);SBLOCK,XP(C)::B(G)
        • S(a);XP(E)::B(G)
        • P(f);SBLOCK,XP(C)::R(H)
      • Refutation
        • Q(h);N_SPINQ(h),XQ(F)
    • Try
      • Q(F);CHECK,N_PINQ(h)
      • Refutation
        • K(g);P-FLIGHT,P_SPINS(a),XP(C)
    • Try
      • Q(F);CHECK,N_PINQ(h)
      • Vars
        • Q(h);P_SPINQ(h)::R(H)
      • Refutation
        • K(g);P-FLIGHT,P_SPINS(a),XP(C)
  • Actual
    • R(H);
    • Threat
      • QAR1(F),XQ(h)
    • Vars
      • Q(h);CHECK,OGATEB::QAR2(F),XQ(h)
      • K(g);P-FLIGHT,P_SPINS(a),XP(C)::QAR2(F),XQ(h)
      • Q(h);OGATE,XQ(F)::R(H),XQ(h)
      • R(d);SBLOCK,XP(C)::QAB(F)
      • S(a);XP(E)::QAB(F)
      • P(f);SBLOCK,XP(C)::QAR(F)
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